Recent content by Immacomputer

That's a pretty **** poor way of designing a tline really. Sometimes it can work out and other times it won't.

I would do this design. This puts the sub in an optimal location and will have transmission line effects around 40hz. It should have a solid bottom end down to about 30hz and maybe a little deeper depending on the vehicle acoustics. I know this thread is old, but I'm bored and so I designed this...

I'll see about trying to fit a tline first and see how big it is. Tuning line length to fs and line area to SD isn't usually optimal so it should be smaller than a line using that method. I never design mine like that and I've always had good results.

I might be able to do something for you this weekend. What are your max dimensions? What kind of vehicle is it going in?

Those port area figures seem pretty small. You will probably have substantial port noise. Also, I agree that group delay is a bad way of checking for "SQ" in a box design. The inductance of the driver and the frequency response of the sub+box+vehicle are going to be the biggest factors in...

Just to clarify, every ported enclosure (whether prefab or not) has a tuning frequency. This is its inherent nature. Just like a beer bottle will hum at a specific frequency depending on how full it is. That is its "tuning frequency" or resonant frequency. Most prefab enclosures are tuned very...

With those max dimensions, it won't really be possible to squeeze out 7 cubes without really cutting back the port area and putting the port in the middle kills even more airspace. I did come up with something that's 6.5 cubic feet after subs port and bracing displacement tuned around 33hz. I...

Bazooka?

The $900 price was for 2.

The size of the sub has nothing to do with how low or how high it plays, frequency wise nor does it determine transient response (ie, you can have an 18" sub have better sound quality than a 10" sub and have better transients). T/S parameters, enclosure, and vehicle determine that. I just had to...

They have very similar T/S parameter so I would think they would. How the enclosure will react in your vehicle is another story but I can't imagine it sounding horrible, just not as flat. The sad ending to this story though is that I don't have the design file. I could probably reverse engineer...

I drew up a quick sketch and it seems like it might just barely fit in there. The one I drew up was 45* and you still had about 6.5 cubes and it looked like the mounting depth was good too. So I think 60 should most certainly work and would probably be around 7-7.5 cubes, which should be pretty...

Yea it is possible to do something with if the sub's could be mounted on top with port firing back but 4 sub's firing back with a port takes up a lot of volume. I might be able to do a side port but I kind of doubt it. At least not without sacrificing port area. Port on top would definitely not...

I'm still not believing you're getting anywhere near that with port and subs coming out the front. I tried a number of different ways and there just isn't the airspace with your 49x49 base dimensions. I would say you're better off with the two 18s unless you can increase your depth by about 10...

Haha, yea it's pretty in depth. It helped quite a bit that I was reading it while going to school for electrical engineering and studying electrical transmission lines at the same time (tons of the same math involved). I would suggest taking note of the Alignment Tables pdf on page 3 at the...